mysql_config outputs non-existing mysqlclient

The mysql_config script, which is bundled by MariaDB Server and used by perl module DBD::mysql for locating the client libraries, outputs mysqlclient but starting 10.2.2 this seems to be renamed to mariadbclient. Since the script has not been updated to reflect this, it's no longer possible to compile DBD::mysql with MariaDB Server.

Version 10.2.1 did not yet have this problem, 10.2.2 and 10.2.3 both have this issue.
See also https://github.com/perl5-dbi/DBD-mysql/pull/85#issuecomment-274225886